git.maemo.org Git - azimuth/blob - src/position-publisher.c

   1 /*
   2  * position-publisher.c - Source for PositionPublisher
   3  * Copyright (C) 2010 Guillaume Desmottes
   4  * @author Guillaume Desmottes <gdesmott@gnome.org>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24
  25 #include <telepathy-glib/dbus.h>
  26 #include <telepathy-glib/interfaces.h>
  27
  28 #include <location/location-gps-device.h>
  29
  30 #include "connection-watcher.h"
  31 #include "position-publisher.h"
  32
  33 G_DEFINE_TYPE(PositionPublisher, position_publisher, G_TYPE_OBJECT)
  34
  35 /* properties */
  36 enum
  37 {
  38   PROP_BLUR = 1,
  39   LAST_PROPERTY
  40 };
  41
  42 /* Minimum time before 2 publishing (in seconds) */
  43 #define PUBLISH_THROTTLE 10
  44
  45 /* private structure */
  46 typedef struct _PositionPublisherPrivate PositionPublisherPrivate;
  47
  48 struct _PositionPublisherPrivate
  49 {
  50   ConnectionWatcher *watcher;
  51   LocationGPSDevice *gps_device;
  52   GSList *connections;
  53   GHashTable *location;
  54   /* If not 0, we are waiting before publishing again */
  55   guint throttle_timeout;
  56   /* TRUE if location has been modified while we were waiting */
  57   gboolean modified;
  58   gboolean blur;
  59
  60   gboolean dispose_has_run;
  61 };
  62
  63 #define POSITION_PUBLISHER_GET_PRIVATE(o)     (G_TYPE_INSTANCE_GET_PRIVATE ((o), POSITION_PUBLISHER_TYPE, PositionPublisherPrivate))
  64
  65 static void conn_invalidated_cb (TpProxy *conn,
  66     guint domain,
  67     gint code,
  68     gchar *message,
  69     PositionPublisher *self);
  70
  71 static void publish_to_all (PositionPublisher *self);
  72
  73 static void
  74 remove_connection (PositionPublisher *self,
  75     TpConnection *conn)
  76 {
  77   PositionPublisherPrivate *priv = POSITION_PUBLISHER_GET_PRIVATE (self);
  78
  79   g_signal_handlers_disconnect_by_func (conn, G_CALLBACK (conn_invalidated_cb),
  80       self);
  81   priv->connections = g_slist_remove (priv->connections, conn);
  82   g_object_unref (conn);
  83 }
  84
  85 static void
  86 set_location_cb (TpConnection *conn,
  87     const GError *error,
  88     gpointer user_data,
  89     GObject *weak_object)
  90 {
  91   PositionPublisher *self = POSITION_PUBLISHER (weak_object);
  92
  93   if (error != NULL)
  94     {
  95       g_print ("SetLocation failed (%s): %s\n", tp_proxy_get_object_path (conn),
  96           error->message);
  97
  98       if (error->code == TP_ERROR_NOT_IMPLEMENTED)
  99         {
 100           g_print ("remove connection\n");
 101           remove_connection (self, conn);
 102         }
 103
 104       return;
 105     }
 106
 107   g_print ("SetLocation succeed (%s)\n", tp_proxy_get_object_path (conn));
 108 }
 109
 110 static gboolean
 111 publish_throttle_timeout_cb (gpointer data)
 112 {
 113   PositionPublisher *self = data;
 114   PositionPublisherPrivate *priv = POSITION_PUBLISHER_GET_PRIVATE (self);
 115
 116   priv->throttle_timeout = 0;
 117
 118   if (priv->modified)
 119     {
 120       publish_to_all (self);
 121       priv->modified = FALSE;
 122     }
 123
 124   return FALSE;
 125 }
 126
 127 static void
 128 publish_to_conn (PositionPublisher *self,
 129     TpConnection *conn)
 130 {
 131   PositionPublisherPrivate *priv = POSITION_PUBLISHER_GET_PRIVATE (self);
 132
 133   if (priv->location == NULL)
 134     return;
 135
 136   if (priv->throttle_timeout != 0)
 137     /* We are waiting */
 138     return;
 139
 140   tp_cli_connection_interface_location_call_set_location (conn, -1,
 141       priv->location, set_location_cb, NULL, NULL, G_OBJECT (self));
 142
 143   /* We won't publish during the next PUBLISH_THROTTLE seconds */
 144   priv->throttle_timeout = g_timeout_add_seconds (PUBLISH_THROTTLE,
 145       publish_throttle_timeout_cb, self);
 146 }
 147
 148 static void
 149 publish_to_all (PositionPublisher *self)
 150 {
 151   PositionPublisherPrivate *priv = POSITION_PUBLISHER_GET_PRIVATE (self);
 152   GSList *l;
 153
 154   for (l = priv->connections; l != NULL; l = g_slist_next (l))
 155     {
 156       TpConnection *conn = l->data;
 157
 158       publish_to_conn (self, conn);
 159     }
 160 }
 161
 162 static void
 163 update_position (PositionPublisher *self,
 164     gdouble lat,
 165     gdouble lon,
 166     gdouble alt,
 167     gdouble accuracy)
 168 {
 169   PositionPublisherPrivate *priv = POSITION_PUBLISHER_GET_PRIVATE (self);
 170
 171   g_print ("update position: lat: %f  lon:  %f  alt: %f accuracy: %f\n",
 172       lat, lon, alt, accuracy);
 173
 174   if (priv->location != NULL)
 175     g_hash_table_unref (priv->location);
 176
 177   priv->location = tp_asv_new (
 178       "timestamp", G_TYPE_INT64, (gint64) time (NULL),
 179       "lat", G_TYPE_DOUBLE, lat,
 180       "lon", G_TYPE_DOUBLE, lon,
 181       "alt", G_TYPE_DOUBLE, alt,
 182       "accuracy", G_TYPE_DOUBLE, accuracy,
 183       NULL);
 184
 185   priv->modified = TRUE;
 186
 187   publish_to_all (self);
 188 }
 189
 190 static void
 191 location_changed_cb (LocationGPSDevice *device,
 192     PositionPublisher *self)
 193 {
 194   if (device == NULL)
 195     return;
 196
 197   if (device->fix == NULL)
 198     return;
 199
 200   if (!(device->fix->fields & LOCATION_GPS_DEVICE_LATLONG_SET))
 201     return;
 202
 203   update_position (self, device->fix->latitude, device->fix->longitude,
 204       device->fix->altitude, device->fix->eph / 100.0);
 205 }
 206
 207 static void
 208 conn_invalidated_cb (TpProxy *conn,
 209     guint domain,
 210     gint code,
 211     gchar *message,
 212     PositionPublisher *self)
 213 {
 214   g_print ("connection %s invalidated; removing\n", tp_proxy_get_object_path (
 215         conn));
 216
 217   remove_connection (self, TP_CONNECTION (conn));
 218 }
 219
 220 static void
 221 connection_added_cb (ConnectionWatcher *watcher,
 222     TpConnection *conn,
 223     PositionPublisher *self)
 224 {
 225   PositionPublisherPrivate *priv = POSITION_PUBLISHER_GET_PRIVATE (self);
 226
 227   if (g_slist_find (priv->connections, conn) != NULL)
 228     return;
 229
 230   if (!tp_proxy_has_interface_by_id (conn,
 231         TP_IFACE_QUARK_CONNECTION_INTERFACE_LOCATION))
 232     return;
 233
 234   priv->connections = g_slist_prepend (priv->connections, g_object_ref (conn));
 235
 236   g_signal_connect (conn, "invalidated",
 237       G_CALLBACK (conn_invalidated_cb), self);
 238
 239   publish_to_conn (self, conn);
 240 }
 241
 242 static void
 243 position_publisher_init (PositionPublisher *obj)
 244 {
 245   PositionPublisherPrivate *priv = POSITION_PUBLISHER_GET_PRIVATE (obj);
 246
 247   priv->watcher = connection_watcher_new ();
 248
 249   g_signal_connect (priv->watcher, "connection-added",
 250       G_CALLBACK (connection_added_cb), obj);
 251
 252   priv->gps_device = g_object_new (LOCATION_TYPE_GPS_DEVICE, NULL);
 253
 254   g_signal_connect (priv->gps_device, "changed",
 255       G_CALLBACK (location_changed_cb), obj);
 256
 257   priv->connections = NULL;
 258 }
 259
 260 static void
 261 position_publisher_constructed (GObject *object)
 262 {
 263   PositionPublisher *self = POSITION_PUBLISHER (object);
 264   PositionPublisherPrivate *priv = POSITION_PUBLISHER_GET_PRIVATE (self);
 265
 266   connection_watcher_start (priv->watcher);
 267
 268   if (G_OBJECT_CLASS (position_publisher_parent_class)->constructed)
 269     G_OBJECT_CLASS (position_publisher_parent_class)->constructed (object);
 270 }
 271
 272 static void position_publisher_dispose (GObject *object);
 273 static void position_publisher_finalize (GObject *object);
 274 static void position_publisher_get_property (GObject *object,
 275     guint property_id, GValue *value, GParamSpec *pspec);
 276 static void position_publisher_set_property (GObject *object,
 277     guint property_id, const GValue *value, GParamSpec *pspec);
 278
 279 static void
 280 position_publisher_class_init (PositionPublisherClass *position_publisher_class)
 281 {
 282   GObjectClass *object_class = G_OBJECT_CLASS (position_publisher_class);
 283   GParamSpec *param_spec;
 284
 285   g_type_class_add_private (position_publisher_class, sizeof (PositionPublisherPrivate));
 286
 287   object_class->dispose = position_publisher_dispose;
 288   object_class->finalize = position_publisher_finalize;
 289   object_class->get_property = position_publisher_get_property;
 290   object_class->set_property = position_publisher_set_property;
 291
 292   object_class->constructed = position_publisher_constructed;
 293
 294   param_spec = g_param_spec_boolean ("blur", "Blur?",
 295       "Whether the real GPS position is truncated for privacy concerns.", TRUE,
 296       G_PARAM_CONSTRUCT | G_PARAM_WRITABLE | G_PARAM_READABLE
 297       | G_PARAM_STATIC_STRINGS);
 298   g_object_class_install_property (object_class, PROP_BLUR, param_spec);
 299 }
 300
 301 void
 302 position_publisher_dispose (GObject *object)
 303 {
 304   PositionPublisher *self = POSITION_PUBLISHER (object);
 305   PositionPublisherPrivate *priv = POSITION_PUBLISHER_GET_PRIVATE (self);
 306   GSList *l;
 307
 308   if (priv->dispose_has_run)
 309     return;
 310
 311   priv->dispose_has_run = TRUE;
 312
 313   g_object_unref (priv->watcher);
 314   g_object_unref (priv->gps_device);
 315
 316   for (l = priv->connections; l != NULL; l = g_slist_next (l))
 317     {
 318       g_object_unref (l->data);
 319     }
 320
 321   g_hash_table_unref (priv->location);
 322
 323   if (priv->throttle_timeout != 0)
 324     g_source_remove (priv->throttle_timeout);
 325
 326   if (G_OBJECT_CLASS (position_publisher_parent_class)->dispose)
 327     G_OBJECT_CLASS (position_publisher_parent_class)->dispose (object);
 328 }
 329
 330 void
 331 position_publisher_finalize (GObject *object)
 332 {
 333   PositionPublisher *self = POSITION_PUBLISHER (object);
 334   PositionPublisherPrivate *priv = POSITION_PUBLISHER_GET_PRIVATE (self);
 335
 336   g_slist_free (priv->connections);
 337
 338   G_OBJECT_CLASS (position_publisher_parent_class)->finalize (object);
 339 }
 340
 341 static void
 342 position_publisher_get_property (GObject *object,
 343                                  guint property_id,
 344                                  GValue *value,
 345                                  GParamSpec *pspec)
 346 {
 347   PositionPublisher *self = POSITION_PUBLISHER (object);
 348   PositionPublisherPrivate *priv = POSITION_PUBLISHER_GET_PRIVATE (self);
 349
 350   switch (property_id) {
 351     case PROP_BLUR:
 352       g_value_set_boolean (value, priv->blur);
 353       break;
 354     default:
 355       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
 356       break;
 357   }
 358 }
 359
 360 static void
 361 position_publisher_set_property (GObject *object,
 362                                  guint property_id,
 363                                  const GValue *value,
 364                                  GParamSpec *pspec)
 365 {
 366   PositionPublisher *self = POSITION_PUBLISHER (object);
 367   PositionPublisherPrivate *priv = POSITION_PUBLISHER_GET_PRIVATE (self);
 368
 369   switch (property_id) {
 370     case PROP_BLUR:
 371       priv->blur = g_value_get_boolean (value);
 372       break;
 373
 374       break;
 375     default:
 376       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
 377       break;
 378   }
 379 }
 380
 381 PositionPublisher *
 382 position_publisher_new (gboolean blur)
 383 {
 384   return g_object_new (POSITION_PUBLISHER_TYPE,
 385       "blur", blur,
 386       NULL);
 387 }